>From your code it looks as if the collection is actually a Dictionary of arrays.
>But if that's the case I don't understand the "oInnerJoin.Add(loObject, lnKey, 1)" line - I'd expect
>oInnerJoin.Add(lnKey,loObject);

The key is the second parameter, not the first one.

>IAC I would look in the collection and, if the key already exists then just modify the value. Only add it if is not already present.

Yes, in this case, as it is an object, I can simply update the object as is, once I get a reference to it from the .Item() method.